DRIVETRAIN HAVING A DRIVEABLE REAR AXLE AND HAVING A VEHICLE TRANSMISSION, METHOD FOR OPERATING SAID DRIVETRAIN, AND MOTOR VEHICLE HAVING SAID DRIVETRAIN

摘要

Drivetrain having at least one electric drive machine which is configured for driving a motor vehicle, and having a driveable motor vehicle axle (5) which is designed as a rear axle and for transmitting drive forces of at least one electric drive machine to a roadway surface, and having a vehicle transmission (2) which has at least one transmission ratio stage and which is configured for transmitting drive forces in the direction of the driveable motor vehicle axle (5), wherein said at least one transmission ratio stage can, in at least one operating mode of the drivetrain, be engaged by means of a transmission control unit (4), and wherein the vehicle transmission (2) can, aside from said at least one transmission ratio stage, be shifted by means of said transmission control unit (4) into a neutral position in which a transmission output shaft is freely rotatable relative to a transmission input shaft, and, furthermore, for the control of the electric drive machine, an electric motor control unit (3) is provided, wherein the electric drive machine is, by means of said electric motor control unit (3), operable at least in a motor operating mode and in a neutral mode, in which the electric drive machine is rotatable in a manner free from torque, characterized in that the electric motor control unit (3) and the transmission control unit (4) are connected to one another by means of at least two control lines (10, 11) which are configured for transmitting control commands between said control units (3, 4), and in that a control command can be transmitted by the electric motor control unit (3) via at least one of said two control lines (10, 11) to the transmission control unit (4), such that the transmission control unit (4) sets the vehicle transmission into the neutral position.